spriteBatch.Begin();
for (int y = 0; y < tileMap.GetLength(0); y++)
{
    for (int x = 0; x < tileMap.GetLength(1); x++)
    {
        spriteBatch.Draw(
           tiles[tileMap[y, x]],
           new Vector2(x * tileWidth, y * tileHeight),
           Color.White);
    }
}
spriteBatch.End();